linux-kernel - Re: [PATCH v4 2/7] PCI: Add a helper to identify IOV resources

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Message-ID: <bc5473f8-1c40-4e50-bf8b-43233b3d53a5@amd.com>
Date: Tue, 29 Oct 2024 14:18:32 +0100
From: Christian König <christian.koenig@....com>
To: Michał Winiarski <michal.winiarski@...el.com>,
 linux-pci@...r.kernel.org, intel-xe@...ts.freedesktop.org,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 Bjorn Helgaas <bhelgaas@...gle.com>, Krzysztof Wilczyński
 <kw@...ux.com>, Ilpo Järvinen
 <ilpo.jarvinen@...ux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>,
 Michal Wajdeczko <michal.wajdeczko@...el.com>,
 Lucas De Marchi <lucas.demarchi@...el.com>,
 Thomas Hellström <thomas.hellstrom@...ux.intel.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Matt Roper <matthew.d.roper@...el.com>
Subject: Re: [PATCH v4 2/7] PCI: Add a helper to identify IOV resources

Am 25.10.24 um 23:50 schrieb Michał Winiarski:
> There are multiple places where special handling is required for IOV
> resources.
>
> Extract it to pci_resource_is_iov() helper and drop a few ifdefs.
>
> Signed-off-by: Michał Winiarski <michal.winiarski@...el.com>
> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

Reviewed-by: Christian König <christian.koenig@....com>

> ---
>   drivers/pci/pci.h       | 19 +++++++++++++++----
>   drivers/pci/setup-bus.c |  7 +++----
>   drivers/pci/setup-res.c |  4 +---
>   3 files changed, 19 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index 14d00ce45bfa9..48d345607e57e 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -580,6 +580,10 @@ void pci_iov_update_resource(struct pci_dev *dev, int resno);
>   resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno);
>   void pci_restore_iov_state(struct pci_dev *dev);
>   int pci_iov_bus_range(struct pci_bus *bus);
> +static inline bool pci_resource_is_iov(int resno)
> +{
> +	return resno >= PCI_IOV_RESOURCES && resno <= PCI_IOV_RESOURCE_END;
> +}
>   extern const struct attribute_group sriov_pf_dev_attr_group;
>   extern const struct attribute_group sriov_vf_dev_attr_group;
>   #else
> @@ -589,12 +593,21 @@ static inline int pci_iov_init(struct pci_dev *dev)
>   }
>   static inline void pci_iov_release(struct pci_dev *dev) { }
>   static inline void pci_iov_remove(struct pci_dev *dev) { }
> +static inline void pci_iov_update_resource(struct pci_dev *dev, int resno) { }
> +static inline resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev,
> +							   int resno)
> +{
> +	return 0;
> +}
>   static inline void pci_restore_iov_state(struct pci_dev *dev) { }
>   static inline int pci_iov_bus_range(struct pci_bus *bus)
>   {
>   	return 0;
>   }
> -
> +static inline bool pci_resource_is_iov(int resno)
> +{
> +	return false;
> +}
>   #endif /* CONFIG_PCI_IOV */
>   
>   #ifdef CONFIG_PCIE_PTM
> @@ -616,12 +629,10 @@ unsigned long pci_cardbus_resource_alignment(struct resource *);
>   static inline resource_size_t pci_resource_alignment(struct pci_dev *dev,
>   						     struct resource *res)
>   {
> -#ifdef CONFIG_PCI_IOV
>   	int resno = res - dev->resource;
>   
> -	if (resno >= PCI_IOV_RESOURCES && resno <= PCI_IOV_RESOURCE_END)
> +	if (pci_resource_is_iov(resno))
>   		return pci_sriov_resource_alignment(dev, resno);
> -#endif
>   	if (dev->class >> 8 == PCI_CLASS_BRIDGE_CARDBUS)
>   		return pci_cardbus_resource_alignment(res);
>   	return resource_alignment(res);
> diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> index 23082bc0ca37a..ba293df10c050 100644
> --- a/drivers/pci/setup-bus.c
> +++ b/drivers/pci/setup-bus.c
> @@ -1093,17 +1093,16 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
>   			     (r->flags & mask) != type3))
>   				continue;
>   			r_size = resource_size(r);
> -#ifdef CONFIG_PCI_IOV
> +
>   			/* Put SRIOV requested res to the optional list */
> -			if (realloc_head && i >= PCI_IOV_RESOURCES &&
> -					i <= PCI_IOV_RESOURCE_END) {
> +			if (realloc_head && pci_resource_is_iov(i)) {
>   				add_align = max(pci_resource_alignment(dev, r), add_align);
>   				r->end = r->start - 1;
>   				add_to_list(realloc_head, dev, r, r_size, 0 /* Don't care */);
>   				children_add_size += r_size;
>   				continue;
>   			}
> -#endif
> +
>   			/*
>   			 * aligns[0] is for 1MB (since bridge memory
>   			 * windows are always at least 1MB aligned), so
> diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
> index c6d933ddfd464..e2cf79253ebda 100644
> --- a/drivers/pci/setup-res.c
> +++ b/drivers/pci/setup-res.c
> @@ -127,10 +127,8 @@ void pci_update_resource(struct pci_dev *dev, int resno)
>   {
>   	if (resno <= PCI_ROM_RESOURCE)
>   		pci_std_update_resource(dev, resno);
> -#ifdef CONFIG_PCI_IOV
> -	else if (resno >= PCI_IOV_RESOURCES && resno <= PCI_IOV_RESOURCE_END)
> +	else if (pci_resource_is_iov(resno))
>   		pci_iov_update_resource(dev, resno);
> -#endif
>   }
>   
>   int pci_claim_resource(struct pci_dev *dev, int resource)